System for heating liquids



July 29, 1947. v, F, PARRY SYSTEM FOR HEATING LIQUIDS Filed NOV. 7, 1945 I/ I l/ Verizon/ Z Parry,

flttorneg Patented July 29, 1947 "UNITED STATES 2,424,844 PATENT OFFICE SYSTEM son HEATING LIQUIDS Vernon F. Parry, Golden, Colo., assignor to the United States of America, as represented by the Secretary of the Interior I amended April 30, 1928; 370 0. G. 757) The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment to me of any royalty thereon in accordance with the provisions of theact of April 30, 1928 (ch. 460, 45 Stat. L. 467).

My invention relates to a system for heating liquids and particularly to one in combination with a coal stoker which preheats water with heat which would otherwise be'wasted by conduction through the walls of a flue.

In the accompanying drawings illustrating one embodiment of my invention:

The single figure represents a vertical partial section which diagrammatically illustrates the operation of my system.

A closed base I I is provided with an airtight cleanout closure, not shown, and supports a combustion dome l2 provided with a water jacket II and a discharge duct I4 for hot products of combustion. The jacket I3 is connected with a water heating coil l5 within a combustion flue it of a water jacket H which is provided with a heat conserving insulating jacket ID. A Water supply pipe l9 extends downwardly through the water jacket I! into which Water is discharged from this pipe near the bottom of this jacket. The cooled products of combustion are discharged through a, stack and hot water may be drawn through a hot water discharge pipe 2| 22.

A water storage tank 23 is provided with a heat insulating jacket 24 and is supplied with preheated water from the top of the water jacket ll through a pipe 25 which extends downwardly through the tank 23 to discharge water near the bottom of the tank. The discharge pipe 22 has a by-pass circulating pipe 26, which provides for a returnv circulation of Water through the tank 23 whenever the temperature of water in the storage tank falls below a predetermined maximum temperature and no water is being drawn through the pipe 22. A manually-operated blow-of! valve 21 provides for the removal of sediment from the storage tank 23 and a second blow-oil. valve 28 likewise provides for the removal of sediment from the water jacket H.

A heat responsive switch 29 is mounted upon and near the top of the tank 23 is connected by an electric circuit 30 with an electric motor 3| which operateslan automatic fuel stoker 32 which delivers granular fuel to a stoker retort 33 from which ashes overflow into an ash can 34 which can be withdrawn for emptying through the cleanout closure.

The period or interval of operation of the heat responsive switch 29, when no water is being drawn from the system, is governed by the rate of heat losses from water storage tank 23, and the thickness of the insulation jacket 24 is adjusted to produce the desired interval. When burning low-rank fuels the interval between operations is in the range of 50 to 300 minutes, the

interval decreasing as the rank of the fuel in- My system will therefore remain operative when consuming no power whatsoever for about 80 percent of the time, and economy, as well as higher efiiciency is attained.

My system is designed for efflcient utilization of the heat units of the consumed fuel, and particularly for preheating in the water jacket I! the water with heat which would otherwise be wasted as well as for maintaining water in the storage tank 23.

I have shown and described one embodiment. of my invention, but it is to be understood that it is capable of many modifications. Changes, therefore, in the construction and arrangement may be made without departing from the spirit and scope of the invention, as disclosed in the appended claims, in which it is my intention to claim all the novelty inherent therein as broadly as possible in view of the prior art.

What I claim is:

l. A water heating system comprising a water jacketed combustion dome provided with a discharge duct, a water heating coil operatively connected with said dome, a Water jacket provided with a flue for products of combustion surrounding said coll, means for admitting water from an external source to said water jacket, a hot water 40 discharge pipe coupled to said coil, a water storage tank operatively connected to the top of said water jacket, means connecting said storage tank with said water jacketed dome, heat-responsive switch mounted on said storage tank to be operated by fluctuations in the temperature of water in said storage tank, and an electric motor of an automatic fuel stoker electrically connected with said switch.

2. A water heating system comprising a water jacketed combustion dome provided with a discharge duct, a water heating coil operatively connected with said dome, a water jacket provided with a flue for products of combustion surrounding said coil, an external heat insulating jacket for said water jacket, a water supply pipe in said water jacket discharging near the bottom of the jacket, a heated water discharge pipe coupled to said coil. a heat insulated hot water storage tank, a pipe from the top of said water jacket extending downwardly through said storage tank, a

pipe connecting said storage tank with said dome. a circulating pipe connecting the top of said storage tank with said water discharge pipe, a heat responsive switch mounted on said storage tank adapted to close an electric circuit whenever the temperature oi the water in the storase tank falls below a predetermined minimum and to break the circuit at a predetermined maximum temperature, and an electric motor adapted to be operated only when said heat responsive switch maintains a closed electric circuit to said motor, and an automatic fuel stoker operated by said motor.

3. A water heating system comprising a water jacketed combustion dome provided with a discharge duct for products of combustion. a water heating coil operativeiy connected with said dome and to a heated water discharge pipe, a water jacket provided with a flue for products of combustion surrounding said coil, an external heat insulating jacket for said water Jacket, a water adapted to close an electric circuit whenever the temperature of the water in the storage tank falls below a predetermined minimum and to break the circuit at a predetermined maximum temperature, and an electric motor adapted to be operated only when said heat responsive switch maintains a closed'circuit to said motor, and an automatic fuel stoker operated by said motor.

VERNON F. PARRY. 

